In this paper, the effect of a circumferential central groove on an open-ended squeeze film damper is analytically investigated. Flow equations in both the central groove and film land are solved by applying the technique of separation of variables. Model validation is presented by a rotor-squeeze film damper test rig using a recorded squeeze film damper film pressure, where a significant improvement from a classical squeeze film damper model is shown. It is found that the central groove has a high and stable pressure region while neglecting the groove effect that would over-estimate the damping force. Both simulation and experiment show that the increase of supply flow escalates the damper pressure and it could possibly avoid the film cavitation, thus raising the squeeze film damper reaction force. In addition, the effects of different groove cross-section shapes including rectangle, square, semi-circle, and semi-ellipse are evaluated. Model sensitivity shows that the size of the central groove has more impact on the damper performance than the shape of the groove.

在本文中，分析性研究了圆周中央凹槽对开口式挤压膜阻尼器的影响。通过使用变量分离技术来求解中心槽和膜槽中的流动方程。通过使用记录的挤压膜阻尼器膜压力的转子挤压膜阻尼器测试装置进行模型验证，其中显示了与传统挤压膜阻尼器模型相比的显着改进。发现中央凹槽具有高且稳定的压力区域，而忽略了会过高估计阻尼力的凹槽效应。仿真和实验均表明，供应流量的增加使阻尼器压力逐渐增大，有可能避免薄膜气蚀，从而提高了挤压薄膜阻尼器的反作用力。此外，评估了矩形，正方形，半圆形和半椭圆形的不同凹槽横截面形状的影响。模型灵敏度表明，中央凹槽的尺寸比凹槽的形状对减震器性能的影响更大。